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J. O. PAIGE.

DAMPER REGULATOR." No. 324,270. Patented Aug. 11, 1885.

P w i- M WITNESSES //V VE/VTOR By Attorneys %LW N. PETERS,PMn-Lllhognphnr. walhin tm 0.0.

UNITED STATES PATENT Utmost.

JOHN G. PAIGE, OF STONEHAM, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TOGEORGE A. OSGOOD, OF SAME PLACE.

'DAMPER-REGULATOFL' SPECIFICATION forming part of Letters Patent No.324,270, dated August 11, 1885.

Application filed June 1, 1885.

To aZZ whom it may concern.-

Be it known that I, JOHN C. PAIGE, of Stoneham, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Damper-Regulators, of which the followingisaspecification.

This invention relates to appliances operated by variations of pressurein a steam-boiler to move a damper in a flue from the furnace whichgenerates the steam to the chimney thereof, so that when the pressurerises above or falls below a given point the draft is checked orincreased, as the case may be.

The object of the invention is to provide a simple, durable, and compactapparatus of this class; and it consists in the several improvementswhich I will now proceed to describe.

Of the accompanying drawings, forming a part of this specification,Figure 1 represents a front view of a boiler, its casing or setting, anda part of the chimney in connection with my improved regulator. Fig. 2represents a vertical section of the regulator.

The same letters of reference indicate the same parts in allthe figures.

a represents a casing composed of two parts or sections bolted togetherand having a cham her or space, 1), between them which communicatesthrough a pipe, 0, with the lower portion of the steam-boiler, thecasing having a passage, 1), screw-threaded at its outer end, intowhichthe pipe 0 is screwed. The chamber b is circular in horizontal sectionand contains a circular piston, e, which has a limited vertical play inthe chamber. The periphery of the piston is separated from thesurrounding surface of the chamber by an annular space into which isinserted'a packing ring or rings, f, of rubber, each ring being composedof a cylindrical piece of rubber, so that it serves both as apacking-ring and as an annular roller permitting the free vertical playof the piston.

On the upper side of the piston is a central boss, 6, which projectsinto a guiding-opening, g, in the top of the casing.

h represents a lever bearing upon a link, i, which is supported by theboss 6. Said lever is provided at one end with an aperture which (Nomodel.)

receives a knife-edged stud, j, affixed to cars 7c on the casing, saidstud constituting the fulcrum of the lever and being in close proximityto the link 15. The outer end of the lever h has an adj us able weight,m.

n rep resents a second lever fulcrumed at one end on a knifeedged stud,0, attached to cars l p on the casing.

1' represents a link interposed between the levers h n, and supportingthe lever a at a point near its fulcrum. The lever 12 has an adjustableweight, .9, and is extended asufiicient distance to enable it to givemotion through a rod, t, to a crank, u, on the axis of a damper, o ,inthe flue leading from the furnace or boilercasing to the chimney.

The operation is as follows: The pressure in the boiler is communicatedthrough the pipe 0 to the piston e, and either raises said piston orallows it to be depressed by the weighted levers;accordingly as thepressure increases or diminishes. \Vhen the piston is raised, the outerends of the levers h n are raised by it,and the lever a is caused topartially close the damper, thus checking the fire and preventingfurther increase of steam-pressure. IVhen-the piston falls, the damperis opened and the heat of the fireincreased. The rolling packingringsprevent the water or steam that actuates the piston from passing thepiston, the rolling motion of the rings preventing them from bepiston.

It will be observed that the fulcrums of the levers h a are at oppositesides of the center of the casing, and that said levers projectinopposite directions, so that they counterbalance each other, andtherefore have no tendency to tip the casing in either direction. Thisarrangement enables the casing and the entire apparatus to be made incompact form, and

its support.

I claim- 1. In a damper-regulator, the combination of the casing havingthe chamber or space Z), adapted to be connected with a steam-boiler,the piston adapted to more in said casing, the rolling packing ring orrings interposed being worn or chafed by the movementswj il e alsoenables the casing tobe easily secured to.

tween said piston and the surrounding surface roo of the chamber, andthe dampenoperating devices supported by the piston, as set forth.

2. The combination of the casinghaving the chamber or space 1), adaptedto be connected 5 with asteain-boiler, the piston in said chamber havinga central boss projecting into an opening in the casing,the levers h n,fulcrumed at opposite sides of the center of the casing and extending inopposite directions across [0 the casing, as shown, whereby theapparatus is counterbalanced, and thclinksi 1', supporting the levers,as set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 27th day of 1 May, 1885.

JOHN C. PAIGE.

Vitnesses:

CHARLES E. HORNE, HARRY WEED.

